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Star in the constellation Serpens
Upsilon Serpentis ,
Latinized from υ Serpentis, is a
star in the Serpens Caput section of the
constellation
Serpens . Based upon an annual
parallax shift of 13.04
mas as seen from Earth, it is located around 250
light years from the
Sun . The star is bright enough to be faintly visible to the naked eye, having an
apparent visual magnitude of +5.70.
[2] It is a member of the
Hyades group , a stream of stars that share a similar trajectory to the
Hyades cluster .
[11]
This is an
A-type main sequence star with a
stellar classification of A3 V.
[3] It has an estimated 2.9
[6] times the
mass of the Sun and around 2.2
[7] times the
Sun's radius . With an age of 403
[6] million years, it has a high rate of spin with a
projected rotational velocity of 133 km/s.
[9] It is radiating 23
[8] times the
solar luminosity from its
photosphere at an
effective temperature of 8,917 K.
[6]
Upsilon Serpentis is a suspected
astrometric binary ,
[12] which means an undetected companion is
perturbing the motion of the visible star. An
X-ray emission has been detected from this system with a luminosity of 247.8× 1020 W . This may be coming from the companion, since A-type stars are not expected to emit X-rays.
[13]
References
^
a
b
c
d
e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664,
arXiv :
0708.1752 ,
Bibcode :
2007A&A...474..653V ,
doi :
10.1051/0004-6361:20078357 ,
S2CID
18759600 .
^
a
b
c
d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data ,
SIMBAD ,
Bibcode :
1986EgUBV........0M .
^
a
b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal , 74 : 375–406,
Bibcode :
1969AJ.....74..375C ,
doi :
10.1086/110819 .
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14,
arXiv :
1208.3048 ,
Bibcode :
2012A&A...546A..61D ,
doi :
10.1051/0004-6361/201219219 ,
S2CID
59451347 , A61.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331,
arXiv :
1108.4971 ,
Bibcode :
2012AstL...38..331A ,
doi :
10.1134/S1063773712050015 ,
S2CID
119257644 .
^
a
b
c
d
e
f
g Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal , 152 (2): 13,
arXiv :
1604.06456 ,
Bibcode :
2016AJ....152...40G ,
doi :
10.3847/0004-6256/152/2/40 ,
S2CID
119179065 , 40.
^
a
b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (3rd ed.): 521–524,
arXiv :
astro-ph/0012289 ,
Bibcode :
2001A&A...367..521P ,
doi :
10.1051/0004-6361:20000451 ,
S2CID
425754 .
^
a
b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–57,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^
a
b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics , 463 (2): 671–682,
arXiv :
astro-ph/0610785 ,
Bibcode :
2007A&A...463..671R ,
doi :
10.1051/0004-6361:20065224 ,
S2CID
18475298 .
^
"phi Ser" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2017-03-23 . {{
cite web }}
: CS1 maint: postscript (
link )
^ Eggen, O. J. (October 1982), "The Hyades main sequence", Astrophysical Journal Supplement Series , 50 : 221–239,
Bibcode :
1982ApJS...50..221E ,
doi :
10.1086/190826 .
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",
Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879,
arXiv :
0806.2878 ,
Bibcode :
2008MNRAS.389..869E ,
doi :
10.1111/j.1365-2966.2008.13596.x ,
S2CID
14878976 .
^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics , 475 (2): 677–684,
Bibcode :
2007A&A...475..677S ,
doi :
10.1051/0004-6361:20077429 .